公开(公告)号：US20090036071A1

公开(公告)日：2009-02-05

申请号：US11829978

申请日：2007-07-30

申请人： Chih-Chia Wang ,  Shu-Mei Li ,  CHINGWO MA ,  Cen-Chieh Huang

发明人： Chih-Chia Wang ,  Shu-Mei Li ,  CHINGWO MA ,  Cen-Chieh Huang

IPC分类号： H01Q11/12

CPC分类号： H01Q3/2611

摘要： A null detector and its corresponding method are provided. The null detector includes a power detector, a smoother, and an overlapper. The power detector outputs a power level signal according to the power level of a received signal. The smoother is coupled to the power detector for determining according to the power level signal whether the received signal is transmitting a null symbol, and then the smoother outputs a null detection signal at a first state value or a second state value indicating the result of the determination. The overlapper is coupled to the smoother for providing the duration and position of the null symbols transmitted by the received signal according to the null detection signal.

摘要翻译： 提供了空检测器及其相应的方法。 空检测器包括功率检测器，更平滑器和重叠器。 功率检测器根据接收信号的功率电平输出功率电平信号。 平滑器耦合到功率检测器，用于根据功率电平信号确定接收到的信号是否正在发送零符号，然后平滑器以第一状态值或第二状态值输出指示结果的结果的空值检测信号 决心。 叠加器耦合到平滑器，用于根据零检测信号提供由接收信号发送的空符号的持续时间和位置。

公开(公告)号：US07873123B2

公开(公告)日：2011-01-18

申请号：US11829978

申请日：2007-07-30

申请人： Chih-Chia Wang ,  Shu-Mei Li ,  Chingwo Ma ,  Cen-Chieh Huang

发明人： Chih-Chia Wang ,  Shu-Mei Li ,  Chingwo Ma ,  Cen-Chieh Huang

IPC分类号： H04L25/06 ,  H04L27/22 ,  H04L25/10

CPC分类号： H01Q3/2611

摘要： A null detector and its corresponding method are provided. The null detector includes a power detector, a smoother, and an overlapper. The power detector outputs a power level signal according to the power level of a received signal. The smoother is coupled to the power detector for determining according to the power level signal whether the received signal is transmitting a null symbol, and then the smoother outputs a null detection signal at a first state value or a second state value indicating the result of the determination. The overlapper is coupled to the smoother for providing the duration and position of the null symbols transmitted by the received signal according to the null detection signal.

摘要翻译： 提供了空检测器及其相应的方法。 空检测器包括功率检测器，更平滑器和重叠器。 功率检测器根据接收信号的功率电平输出功率电平信号。 平滑器耦合到功率检测器，用于根据功率电平信号确定接收到的信号是否正在发送零符号，然后平滑器以第一状态值或第二状态值输出指示结果的结果的空值检测信号 决心。 叠加器耦合到平滑器，用于根据零检测信号提供由接收信号发送的空符号的持续时间和位置。

公开(公告)号：US07746818B2

公开(公告)日：2010-06-29

申请号：US10995235

申请日：2004-11-24

申请人： Kai Pon Kao ,  Chih Chia Wang

发明人： Kai Pon Kao ,  Chih Chia Wang

IPC分类号： H04W4/00

CPC分类号： H04L27/0012

摘要： The present invention provides a single circuit and a method which can identify the WLAN standard of a packet or the modulation type of a packet. The single circuit includes a shift register, N determinators and decision logic. The shift register is configured to receive several periods of the preamble of the packet. Each of the N determinators is configured to determine whether the WLAN standard, or the modulation type, of the packet matches one of the N WLAN standards, or the N modulation types. Decision logic is configured to decide the WLAN standard, or the modulation type, of the packet.

摘要翻译： 本发明提供一种能够识别分组的WLAN标准或分组的调制类型的单电路和方法。 单电路包括移位寄存器，N个判定器和判定逻辑。 移位寄存器被配置为接收分组的前导码的几个周期。 N个判定器中的每一个被配置为确定分组的WLAN标准或调制类型是否匹配N个WLAN标准之一或N个调制类型。 决定逻辑被配置为决定分组的WLAN标准或调制类型。

公开(公告)号：US20090028254A1

公开(公告)日：2009-01-29

申请号：US11829089

申请日：2007-07-27

申请人： Chih-Chia Wang ,  Shu-Mei Li ,  CHINGWO MA ,  Hsin-Chin Hsu ,  Yi-Sheng Lin

发明人： Chih-Chia Wang ,  Shu-Mei Li ,  CHINGWO MA ,  Hsin-Chin Hsu ,  Yi-Sheng Lin

IPC分类号： H04L27/28

CPC分类号： H04L27/2662 ,  H04L27/2671 ,  H04L27/2678

摘要： A time domain symbol timing synchronization circuit is disclosed, which comprises: an autocorrelation function calculator for calculating cyclic prefix autocorrelation functions and an offset time estimator for searching peak positions of cyclic prefix autocorrelation functions to indicate symbol boundary of received communication symbols. The offset time estimator compares a current peak position and a previous peak position. If (a) the difference of the positions is larger than a threshold and (b) the current peak is smaller than a reference average peak, the current peak is determined as false; the offset time estimator weeds out and replaces the current peak position by the previous peak position; and the current peak is not introduced in the reference average peak calculation.

摘要翻译： 公开了一种时域符号定时同步电路，其包括：用于计算循环前缀自相关函数的自相关函数计算器和用于搜索循环前缀自相关函数的峰值位置以指示接收的通信符号的符号边界的偏移时间估计器。 偏移时间估计器将当前峰值位置与先前的峰值位置进行比较。 如果（a）位置差大于阈值，并且（b）电流峰值小于参考平均峰值，则将电流峰值确定为假; 偏移时间估计器除去并将当前峰值位置替换为先前的峰值位置; 并且在参考平均峰值计算中不引入当前峰值。

公开(公告)号：US07742537B2

公开(公告)日：2010-06-22

申请号：US11829089

申请日：2007-07-27

申请人： Chih-Chia Wang ,  Shu-Mei Li ,  Chingwo Ma ,  Hsin-Chin Hsu ,  Yi-Sheng Lin

发明人： Chih-Chia Wang ,  Shu-Mei Li ,  Chingwo Ma ,  Hsin-Chin Hsu ,  Yi-Sheng Lin

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L27/2662 ,  H04L27/2671 ,  H04L27/2678

摘要： A time domain symbol timing synchronization circuit is disclosed, which comprises: an autocorrelation function calculator for calculating cyclic prefix autocorrelation functions and an offset time estimator for searching peak positions of cyclic prefix autocorrelation functions to indicate symbol boundary of received communication symbols. The offset time estimator compares a current peak position and a previous peak position. If (a) the difference of the positions is larger than a threshold and (b) the current peak is smaller than a reference average peak, the current peak is determined as false; the offset time estimator weeds out and replaces the current peak position by the previous peak position; and the current peak is not introduced in the reference average peak calculation.

摘要翻译： 公开了一种时域符号定时同步电路，其包括：用于计算循环前缀自相关函数的自相关函数计算器和用于搜索循环前缀自相关函数的峰值位置以指示接收的通信符号的符号边界的偏移时间估计器。 偏移时间估计器将当前峰值位置与先前的峰值位置进行比较。 如果（a）位置差大于阈值，并且（b）电流峰值小于参考平均峰值，则将电流峰值确定为假; 偏移时间估计器除去并将当前峰值位置替换为先前的峰值位置; 并且在参考平均峰值计算中不引入当前峰值。

公开(公告)号：US07187915B2

公开(公告)日：2007-03-06

申请号：US10952035

申请日：2004-09-28

申请人： Chih-Chia Wang ,  Kai-Pon Kao

发明人： Chih-Chia Wang ,  Kai-Pon Kao

IPC分类号： H04B1/06

CPC分类号： H04W52/52 ,  H03G3/3052

摘要： An Automatic Gain Control (AGC) method and system thereof. The power of a detected signal is first checked to ensure that it is large enough for AGC process. A power average of the detected signal is computed and compared to a first threshold in order to determine whether to proceed with a coarse tune procedure or enter a fine tune procedure. Both Low Noise Amplifier (LNA) gain and Variable Gain Amplifier (VGA) gain are tuned during coarse tune, whereas only the VGA gain is tuned during fine tune. The LNA and VGA gains are tuned to predetermined values during coarse tune, and the VGA gain is adjusted according to a difference between a computed average of power and a second threshold.

摘要翻译： 一种自动增益控制（AGC）方法及其系统。 首先检查检测到的信号的功率，以确保其对AGC过程足够大。 计算检测到的信号的功率平均值并将其与第一阈值进行比较，以便确定是否进行粗调程序或进入微调程序。 低噪声放大器（LNA）增益和可变增益放大器（VGA）增益在粗调调谐期间进行调谐，而只有VGA增益在微调期间进行调谐。 在粗略调谐期间，LNA和VGA增益被调谐到预定值，并且根据计算的功率平均功率和第二阈值之间的差异来调整VGA增益。

公开(公告)号：US20060068733A1

公开(公告)日：2006-03-30

申请号：US10952035

申请日：2004-09-28

申请人： Chih-Chia Wang ,  Kai-Pon Kao

发明人： Chih-Chia Wang ,  Kai-Pon Kao

IPC分类号： H04B7/00 ,  H04B1/06

CPC分类号： H04W52/52 ,  H03G3/3052

摘要： An Automatic Gain Control (AGC) method and system thereof. The power of a detected signal is first checked to ensure that it is large enough for AGC process. A power average of the detected signal is computed and compared to a first threshold in order to determine whether to proceed with a coarse tune procedure or enter a fine tune procedure. Both Low Noise Amplifier (LNA) gain and Variable Gain Amplifier (VGA) gain are tuned during coarse tune, whereas only the VGA gain is tuned during fine tune. The LNA and VGA gains are tuned to predetermined values during coarse tune, and the VGA gain is adjusted according to a difference between a computed average of power and a second threshold.

摘要翻译： 一种自动增益控制（AGC）方法及其系统。 首先检查检测到的信号的功率，以确保其对AGC过程足够大。 计算检测到的信号的功率平均值并将其与第一阈值进行比较，以便确定是否进行粗调程序或进入微调程序。 低噪声放大器（LNA）增益和可变增益放大器（VGA）增益在粗调调谐期间进行调谐，而只有VGA增益在微调期间进行调谐。 在粗略调谐期间，LNA和VGA增益被调谐到预定值，并且根据计算的功率平均功率和第二阈值之间的差异来调整VGA增益。